Revert "Use native async/await support in pub."

sdk/lib/_internal/pub_generated/test/validator/sdk_constraint_test.dart

Index: sdk/lib/_internal/pub_generated/test/validator/sdk_constraint_test.dart
diff --git a/sdk/lib/_internal/pub/test/validator/sdk_constraint_test.dart b/sdk/lib/_internal/pub_generated/test/validator/sdk_constraint_test.dart
similarity index 73%
copy from sdk/lib/_internal/pub/test/validator/sdk_constraint_test.dart
copy to sdk/lib/_internal/pub_generated/test/validator/sdk_constraint_test.dart
index 4efb822037812bc33d33ca2634b05f00682a9310..27c568a4f769a4fd7c9213d71293757a86c06895 100644
--- a/sdk/lib/_internal/pub/test/validator/sdk_constraint_test.dart
+++ b/sdk/lib/_internal/pub_generated/test/validator/sdk_constraint_test.dart
@@ -18,7 +18,7 @@ import '../test_pub.dart';
 import 'utils.dart';
 
 Validator sdkConstraint(Entrypoint entrypoint) =>
-  new SdkConstraintValidator(entrypoint);
+    new SdkConstraintValidator(entrypoint);
 
 main() {
   initConfig();
@@ -30,19 +30,19 @@ main() {
     });
 
     integration('has an SDK constraint without ^', () {
-      d.dir(appPath, [
-        d.libPubspec("test_pkg", "1.0.0", sdk: ">=1.8.0 <2.0.0")
-      ]).create();
+      d.dir(
+          appPath,
+          [d.libPubspec("test_pkg", "1.0.0", sdk: ">=1.8.0 <2.0.0")]).create();
       expectNoValidationError(sdkConstraint);
     });
   });
 
-  test("should consider a package invalid if it has an SDK constraint with "
-      "^", () {
-    d.dir(appPath, [
-      d.libPubspec("test_pkg", "1.0.0", sdk: "^1.8.0")
-    ]).create();
-    expect(schedulePackageValidation(sdkConstraint),
+  test(
+      "should consider a package invalid if it has an SDK constraint with " "^",
+      () {
+    d.dir(appPath, [d.libPubspec("test_pkg", "1.0.0", sdk: "^1.8.0")]).create();
+    expect(
+        schedulePackageValidation(sdkConstraint),
         completion(pairOf(anyElement(contains('">=1.8.0 <2.0.0"')), isEmpty)));
   });
 }